i knew some people that would use my ability to be very supportive to a degree that left me very drained in every possible way.
like the kind that would require your presence at any hours of day/night, without consideration. i think it is my fault for letting them have that much power over me, but i cannot easily deal with feeling that i am not there for someone that needs me. even if it results in me neglecting my own interests to a very serious degree.
that kind of one sided relationship can be very draining.
if you mean the more esotheric kind - i think that some people believe in possibility of such things. i don't have experience with those matters, so i cannot really say.